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Mayo Clinic
University of Iowa
Neurology | June 29, 2019 | Volume: 93 | Issue: 5 | Pages: 208-216
10.1212/wnl.0000000000007872
Neurology | November 7, 2011 | Volume: 77 | Issue: 19 | Pages: 1756-1760
10.1212/wnl.0b013e318236eec2